diff --git a/ipynb/TruncatablePrimes.ipynb b/ipynb/TruncatablePrimes.ipynb
index 323df2e..b76a1a2 100644
--- a/ipynb/TruncatablePrimes.ipynb
+++ b/ipynb/TruncatablePrimes.ipynb
@@ -11,7 +11,7 @@
     "\n",
     "What's special about [this pencil](https://mathsgear.co.uk/products/truncatable-prime-pencil)?\n",
     "\n",
-    "[![](https://community.wolfram.com//c/portal/getImageAttachment?filename=IMG_20181212_120939.jpg&userId=143131)](https://community.wolfram.com/groups/-/m/t/1569707)\n",
+    "[![](https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQju3c-tDhXMmfLbaaogGvcEChC4mAj2LWOCQTGhZA6SQ&s=10)](https://community.wolfram.com/groups/-/m/t/1569707)\n",
     "\n",
     "The 24-digit number printed on this pencil is a prime, and as you sharpen the pencil and remove digits one at a time from the left, the resulting numbers are all primes:\n",
     "\n",